CN2153177Y

CN2153177Y - Microcomputer control speed regulator for tea making machine

Info

Publication number: CN2153177Y
Application number: CN 92230298
Authority: CN
Inventors: 江建中; 姚巨超
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-08-09
Filing date: 1992-08-09
Publication date: 1994-01-12
Anticipated expiration: 2002-08-09

Abstract

The utility model relates to a microcomputer control speed regulator which can realize the slow speed and the variable speed of a tea making machine. The utility model is composed of a microcomputer control unit and a step motor, wherein the microcomputer control unit is composed of a digital disk, a single chip microcomputer, a program memory, a photoelectric coupler and a power amplifier. A setting digital device controls output pulse by the single chip microcomputer according to the program calculation of the program memory, the pulse is output to the power amplifier to drive the step motor to run after photocoupling, and the value of the digital disk can be changed to regulate the rotating speed of the motor conveniently during the running of the tea making machine. The utility model can be used as the power devices of series tea making machines, such as frying machines, kneading machines, tea flatting machines and drying machines.

Description

Microcomputer control speed regulator for tea making machine

This device is suitable for the industry of making machine for processing tea, can directly drive tea processing machine and realize stepless speed regulation.

Tea-processing is because the tender old difference of various fresh teas, tealeaves category difference, just different as " Hangzhou Dragon Well tea " with the tea-manufacturing technology of " the green tree peony in rivers and mountains ", this just requires the speed of tea processing machine (green-keeping machine, kneading machine, tea-flatting machine, dryer) will adapt to different process to require continuously adjustable, require extremely slow rotating speed simultaneously, the rotating speed that requires to export to the tea machine is continuous adjustable at 0.5-30 rev/min.

The stepless speed regulation of each kind is also arranged before the present invention, and DC motor speed-regulating will accomplish to be difficult to below 10 rev/mins, and therefore actual the use also need add mechanical deceleration device, mechanical speed change: worm and gear slows down, and must shut down speed change; The planet gear speed change can directly reach the requirement of speed governing and speed but the cost height.The speed governing of other kinds all has similar situation.

In view of the foregoing; task of the present invention is to manufacture and design a kind of accurately control rate; can under non-stop-machine prerequisite, at random change speed; need not 0.5-30 rev/min of reducing gear motor rotational shaft speed adjustable range; cost is significantly less than other speed regulating device; simple to operate, the speed regulating device of stable and reliable operation.

The method of solution task is: adopted stepping motor when manufacturing and designing this device, single chip microcomputer, digital disk, memory under program, photoelectricity coupling, power amplification circuit, summarizing to get up device is made up of stepping motor and microcomputer control unit two large divisions, wherein stepping motor is the main execution unit of output loading torque, has substituted conventional AC asynchronous motor and DC motor with it.The rotary speed of stepping motor is subjected to the control of loop pulse.Each parameter of loop pulse comprises period T, and several mutually a few bat forms are controlled by microcomputer control unit all.

The microcomputer control unit of these speed regulating device is cores of device; Mainly adopted present more advanced MCS-51 series monolithic, because EPROM is not with in concrete selected single-chip microcomputer inside, the memory EPROM that also designs program in the circuit deposits control program.Select for use 8421 digital disks to set the rotating speed of stepping motor, 8421 digital disks are that binary-coded decimal output has ten positions corresponding 0-9 decimal number respectively, and the data input has immutableness, and it is also very convenient to change.The port of single-chip microcomputer goes to promote the emitting diode work of photoelectricity coupling, has increased the isolation that the photoelectricity coupling has realized the input and output electricity, and system's antijamming capability strengthened.The power amplifier of exporting to pushing stepping motor of photoelectricity coupling, in some other Digit Control Machine Tool, all design and be equipped with various driving power amplifiers, numerical control of machine tools requires stepping motor can be operated in high-speed region reliably, thereby adopted various circuit to improve pulse front edge to guarantee that high velocity is out-of-step free, there is high-low pressure to switch by circuit form, constant current chopper, the single power supply series resistor; By the element branch transistor, Darlington transistor, field effect transistor etc. being arranged, analyze above-mentioned each circuit and exist various defectives respectively, is not that cost just is exactly that efficient is low.

Selective analysis of the present invention the load characteristic of tea machine, all be typical dry friction load, the characteristics that rotating speed is slow; Designed a simple and effective circuit, photoelectricity coupling output directly promotes power tube (pipe should be imitated in Darlington transistor or field), the three-phase of stepping motor is connected in series a resistance respectively and joins with big power tube, the selected selected also different relative resistances than conventional power source crosstalk resistance of series resistor are less than normal, power is also less than normal, the power of power supply also reduces like this, and design considerations motor ultra low speed operation is when the 80% control cut-out power supply for step-by-step motor of walking geometric angle once the step.Make the electric current that flows through motor be no more than rated current, the rising edge that has so promptly improved current waveform increases starting torque, effectively reduces reactive loss again, has improved the efficient of power supply.

The utility model is because adopt stepping motor and system controlled by computer, so device low cruise output torque ratio DC motor speed-regulating is big, slows down to compare with worm and gear and can realize not shutting down the adjusting rotating speed, and price is lower than the planet gear speed governing.

Concrete structure of the present invention is provided by following examples and accompanying drawing; Accompanying drawing one is this apparatus structure and work schematic diagram, be that example describes its operation principle in detail with the control tea drier now: work begins to be provided with 8421 digital disks (5) and is " 1.0 ", turn on the power switch K1, all integrated all energising, automatic reset circuit (3) resets single-chip microcomputer (4), then single-chip microcomputer reading code-disc (5) value is gone into the P1 mouth, single-chip microcomputer is according to program storage unit (1), (2) corresponding program is carried out operational analysis, P3.2, P3.3, the corresponding output of P3.4 A, B, the stepping loop pulse signal of C three-phase triple time, this signal is through the anti-phase promotion photoelectricity coupling of OC door (6) (7), photoelectricity coupling (7) output promotes power amplifier (8) work, power amplifier (9) drive stepping motor (10) running, its tachometer value are that the set point " 1.0 " of digital disk (5) is that per minute 1.0 changes.Large single sheet machine (4) P3 mouth output frequency is high more more for the digital disk numeral, and rotating speed is fast more, and it is high more that stepping motor (10) axle drives tea processing machine (9) speed of service by bindiny mechanism.

Accompanying drawing two is electrical schematic diagrams; The whole hardware configurations and the principle thereof of this device have been expressed.

Claims

1, a kind of tea processing machine Microcomputerized PWM speed regulator, control unit and motor are electrically connected in proper order, it is characterized in that: with single chip microcomputer (4) is that center electrical connection digital disk (5) serves as that input is set, be electrically connected memory cell (1) and deposit microcomputor program, be electrically connected photoelectricity coupling (7) output step-by-step impulse and move through power amplifier (8) pushing stepping motor (10).

2, device according to claim 1 is characterized in that digital disk (5) is made up of two 8421BCD code-discs, and output is electrically connected with single chip microcomputer I/O mouth.

3, device according to claim 1 is characterized in that single chip microcomputer (4) is the MCS-51 series monolithic.

4, device according to claim 1 is characterized in that power amplifier (8) is electrically connected noninductive current-limiting resistance by high-power darlington pipe or field effect transistor and forms, and input is electrically connected with photoelectricity coupling (7), and output is electrically connected with stepping motor (10).

5, device according to claim 1 is characterized in that memory cell (1) deposits control program and be electrically connected with single chip microcomputer (4).